College Physics
10th Edition
ISBN: 9781285737027
Author: Raymond A. Serway, Chris Vuille
Publisher: Cengage Learning
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Textbook Question
Chapter 5, Problem 24P
Two blocks are connected by a light string that passes over two frictionless pulleys as in Figure P5.24. The block of mass m2 is attached to a spring of force constant k and m1 > m2. If the system is released from rest, and the spring is initially not stretched or compressed, find an expression for the maximum displacement d of m2.
Figure P5.24
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2. A box is given a brief push up a ramp so that it is initially moving at a speed of 6.25 m/s up the rar
The box weighs 60.4 N, the angle of the ramp is 20.5°, and the coefficients of friction between the
box and ramp are μs= 0.650 and μk= 0.333. (see the figure)
a.
What is the magnitude and direction of the acceleration of the box while it is sliding up the
ramp?
b. How far up the ramp does the box slide before it stops?
C.
Will the box stay stopped at the top, or will it slide back down? (Show your reasoning
clearly.)
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Vo = 6.25 m/s
Ax = ?
سکتے
20.5°
Wnet = m(v₁)² = m(v₁)², Wnet = Σ₁ W₁, W = Fd cos 0
Problem 1:
A 2.0 kg box slides on a floor. A friction force of 5.0 N opposes the motion. If the box starts with
a speed of 5.5 m/sec, how far does is slide before coming to rest? Answer: d = 6.1 m
Problem 2:
What is the force a 60.0 kg sprinter exerts backward on the track to accelerate from 2.00 m/sec
to 8.00 m/sec in a distance of 25.0 m, if they encounter a wind that exerts an average force of
30.0 N against them?
Hint: Wnet = Wrunner - Wwind. Answer: Frunner: = 102.0 N
Problem 3:
A 500-kg dragster accelerates from rest to a final speed of 110 m/sec in 400 m (about a quarter
of a mile) and encounters an average frictional force of 1200 N. What is the work done by the
dragster? Hint: Wnet = Wdragster - Wfriction. Answer: Wdragster = 3.5 × 106 J
You smuggle your bathroom scale on an amusment park roller coaster. At the top of a 16 m radius loop, you look down and note that you weigh 3 times your normal weight. At the bottom of the loop, you are gently brought to temporary rest by a spring that compresses 30 m before launching you around the loop backwards. Ignore friction and assume the mass of the car is 200 kg and the mass of just the rider is 50 kg. The track has negligible friction. What spring constant is needed for such ride?
Chapter 5 Solutions
College Physics
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